(S)he implies that your friend’s phone being compromised will leak data about you (email address, physical address, birth date, mails you sent, etc)
I pretty much opertate from the point of view that anything I send in an email or text is public, and temper what I write accordingly.
I've started referring to software developers (like myself) with intentional irony as "mutant lizard people" after hearing one too many times how a particular OS/tool/programming language needs to be designed "for humans" (i.e, n00bs with no prior exposure to it).
I’ve written a couple personal apps that sync with health kit data collected from my Apple Watch and nutrition apps to help me track things in a way that is useful for my fitness goals. In 2016-2017 I used these apps to put on 30 lbs and stay relatively lean but I’ve never wanted to publish them in the app store. I don’t pay for any developer program. Just need to download some (free) developer tools / SDK for XCode, build the source, and put it on my phone. The install is tethered, but afterwards it stays there until I delete it. Restarting the phone doesn’t delete the app either. Only time I needed to re-install was when my 5s crapped out and I had to get a new phone.
Edit: Disregard my comment. I clicked the link and understand the context of your comment now. Still, if you want to code and deploy your own apps you can do it but there are conditions.
Sorry if I sound like a broken record [1]. I don't own an iOS device at the moment. I would love to get an iPad but it kind of sucks that I can't compile and run my own apps.
[1] Previously on HN https://news.ycombinator.com/item?id=16993157